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  1. ZERO_TO_TWENTY = {
  2.   0  => nil,
  3.   1  => "one",
  4.   2  => "two",
  5.   3  => "three",
  6.   4  => "four",
  7.   5  => "five",
  8.   6  => "six",
  9.   7  => "seven",
  10.   8  => "eight",
  11.   9  => "nine",
  12.   10 => "ten",
  13.   11 => "eleven",
  14.   12 => "twelve",
  15.   13 => "thirteen",
  16.   14 => "fourteen",
  17.   15 => "fifteen",
  18.   16 => "sixteen",
  19.   17 => "seventeen",
  20.   18 => "eighteen",
  21.   19 => "nineteen"
  22. }.freeze
  23.  
  24. TENS = {
  25.   2 => "twenty",
  26.   3 => "thirty",
  27.   4 => "forty",
  28.   5 => "fifty",
  29.   6 => "sixty",
  30.   7 => "seventy",
  31.   8 => "eighty",
  32.   9 => "ninety"
  33. }.freeze
  34.  
  35. NUMBER_SCALE = [
  36.   nil,
  37.   "thousand",
  38.   "million",
  39.   "billion",
  40.   "trillion"
  41. ].freeze
  42.  
  43. def in_english(number)
  44.   number = number.to_i
  45.   raise RangeError if number < 0 or number > 999_999_999_999
  46.   return "zero" if number.zero?
  47.  
  48.   chunks = []
  49.   number, chunks[chunks.count] = number.divmod(1000) while number > 0
  50.  
  51.   strings = chunks.map do |number|
  52.     string = []
  53.     hundreds, remainder = number.divmod(100)
  54.     string << "#{ZERO_TO_TWENTY[hundreds]} hundred" if hundreds > 0
  55.  
  56.     tens, units = remainder < 20 ? [nil, remainder] : remainder.divmod(10)
  57.     string << [ TENS[tens], ZERO_TO_TWENTY[units] ].compact.join("-")
  58.  
  59.     string.join(" ")
  60.   end
  61.  
  62.   strings.zip(NUMBER_SCALE).reverse.flatten.compact.join(" ")
  63. end
  64.  
  65. # =========
  66.  
  67. number = 1_123_456_089
  68. p in_english(number)
Success #stdin #stdout 0.02s 7464KB
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"one billion one hundred twenty-three million four hundred fifty-six thousand eighty-nine"
https://ideone.com/1pAkAV
language:
Ruby (ruby 2.5.5)
created:
9 years ago
visibility:
public

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